Boiler of locomotive-engines



NI STATES PATENT OFFICE.

JOHN PENNIMAN, OF BALTIMORE, MARYLAND.

BOILER OF LOCOMOTIVE-ENGINES.

Specification of Letters Patent No. 1,568, dated April 24, 1840.

To all whom l? may concern.'

Be it known that I, JOHN PENNIMAN, of the city of Baltimore, in theState of Maryland, have invented a new and improved method ofconstructing the boilers of steamengines, by means of which improvementa continual circulation of the water contained in the boiler isobtained, the heat from the furnace is more equally diiiused, a largerquantity of steam is produced, and the boiler itself is rendered moredurable; and I do hereby declare that the following is a full and exactdescription thereof.

In the accompanying drawing I have represented in Figure l a part of atubular boiler, such as is in ordinary use for locomotive steam engines,to which boiler my improvement is particularly applicable.

H, is the lire boX, G, the door leading into it, and F, a portion offuel.

B, is the lower part of the front of the boiler, I, I, I, the tubespassing through the boiler in the ordinary way, and surrounded by thewater J, J, J. The water line is shown at N, and L is a vpart of thesteam chamber. n

My improvement consists in the placing a number of tubes on the frontplate of the boiler, which tubes connect the lower part thereof with theupper, said tubes standing in the fire boX, and being exposed to thedirect action of the fire. One of these tubes is shown at A, in Fig. 1,and a series of them at A, A, A, in Fig. 2. They are shown separately,and on a larger scale at A, A, FigsQ and 4. The effect of these tubeswill be to produce the circulation of the water in the boiler, in thefollowing way: As these tubes open below into the lower part of theboiler,

and at their upper ends into the upper part of it, below the water line,the water which will become highly heated in the lower parts of thetubes, will naturally ascend, and that with considerable rapidity,toward the upper part, where they will give out their steam, and by theaction of the water circulating through them they will necessarily drawthe water in the lower part of the boiler to-Ward them, and effecttherequired circulation. Should it be found desirable to expose a largerportion of the water in the tubes to the action'of the heat, said tubesmay descend and project out to a greater distance in the fire bo-X, asrepresented by the dotted lines at O. There will be little or no dangerof the heat aifecting these tubes injuriously, as the circulation ofwater through them will necessarily keep them supplied with that iiuid.

Having thus fully described the nature of my improvement, and the mannerin which I carry the same into operation, what I claim therein as myinvention, and desire to secure by Letters Patent, is

The placing a series of circulating tubes on the front plate of theboiler, in such a manner, as that they shall at their lowery endscommunicate 4with the water in the lower part of the boiler, and attheir upper ends with the water in said boiler a little below the waterline, while they are, along their who-le length, exposed to the directaction of the heat in the lire box, in the manner and for the purposeabove set forth.

p JOHN PENNIMAN. Witnesses: v

TI-Ios. I). JONES, GEORGE VEST.

